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Question

The most thermodynamically stable allotropic form of phosphorus is_______.

A
red
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B
white
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C
black
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D
yellow
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Solution

The correct option is C black
Black phosphorus is the thermodynamically stable form of phosphorus at room temperature and pressure. It is obtained by heating white phosphorus under high pressures (12,000 atmospheres). In appearance, properties and structure it is very much like graphite, being black and flaky, a conductor of electricity, and having puckered sheets of linked atoms.

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